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Demonstration and Evaluation of Potato Varieties and Fungicide Spray Frequencies for Management of Late Blight (Phytophthora infestans) Disease in Silte and Hadya Zone, Southern Ethiopia

Metiku Kebede


Late blight disease caused by Phytophthora infestans is one of the major constraints on potato production in Ethiopia. The present research was designed with the aim of evaluating potato varieties and fungicide application frequencies for the management of late blight. The combinations of two different potato varieties with three different levels of fungicide application frequencies were used in Alicho wuriro and Analomo research substation during 2014 and 2015 main growing seasons. The experiment was laid out in randomized complete block design in factorial arrangement with three replications. Unsprayed controls were also included to allow maximum disease severity for comparison. The interaction effect of potato varieties and fungicide application frequency significantly (p≤0.05) affected disease severities, Area under disease progress curve (AUDPC) and tuber yield. The result of the study revealed that the maximum disease severity of 19.5 to 55.9% at Alicho wuriro and 23 to 49.8% in Analimo was recorded in plots sprayed three times and plots without spraying, respectively. There was a significant negative correlation between disease incidence, severity and AUDPC to that of yield with correlation coefficient ranging from r=–0.47** to r=–0.95**. The trials clearly determined the appropriate fungicide frequency for management of the late blight. The improved Jallene variety combined with three applications of Ridomil MZ 63.5% WP gives the highest commercial yields. However, more research is needed to determine the appropriate frequency of fungicides in different agro-ecologies, with integration of host resistance, for more inclusive recommendations.


AUDPC, fungicide, late blight, severity, yield

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Horton D, Sawyer RL. The potato as a world food crop, with special reference to developing areas. In: Potato physiology. London: Academic Press; 1985; 1–34.

CSA (Central Statics Agency). Agricultural sample survey: Report on area and production of major crops (Private peasant holdings, Meher Season). Addis Ababa, Ethiopia: CSA; 2020; 1: 14.

Nsemwa LTH, Mwalyego FM, Kabungo DA. A review of past crop protection research in the Southern Highlands of Tanzania and prospects for the future. In Proceedings of an international conference on agricultural research, training and technology transfer in the southern highlands of Tanzania: past achievements and future prospects. 1992; 5–9.

Rees DJ, Ekpere JA, Kamasho JA, Gillings SI, Mussei ANK, Temu AEM. Adapting research to farmers’ circumstances in the southern highlands of Tanzania. In Proceedings of an international conference on agricultural research, training and technology transfer in the southern highlands of Tanzania: past achievements and future prospects. 1992; 5–9.

Borgal HB, Arend C, Jacobi Kanyarukis S, Kulazia A, Lemaga BL, Mogaeka, Prante W. Production, marketing and consumption of potato in the Ethiopia highlands’ (Holleta, Awassa, and Alemaya) Center of Advanced training in agricultural development technology. University of Berlin. 1980.

Bekele Kassa, Gebremedhin Woldegiorgis. Effect of planting date on late blight severity and tuber yield on different potato varieties. Pest Management Journal of Ethiopia (PMJoE). 2000; 4(1&2): 51–63.

Clayton RC, Shattock RC. Reduced fungicide inputs to control Phytophthora infestans in potato cultivars with high levels of polygenic resistance. Potato Res. 1995; 38(4): 399–405.

Fry WE. Integrated effects of polygenic resistance and a protective fungicide on development of potato late blight. J Phytopathol. 1975; 65: 908–911.

Kirk WW, Niemira BA, Stein JM. Influence of storage temperature on rate of potato tuber tissue infection caused byPhytophthora infestans (mont.) de bary estimated by digital image analysis. Potato Res. 2001; 44(1): 87–96.

Van der Plank JE. Disease resistance in plants. New York, USA: Academic Press; 1968.

Syngenta Group Company. Residual and systemic fungicide for the control of different kinds of diseases in fruits and vegetables. Basle, Switzerland: Syngenta Crop Protection AG; 2010.

Rotem J, Sari A. Fertilization and age-conditioned predisposition of potatoes to sporulation of and infection by Phytophthora infestane/Einfluß der Düngung und altersbedingter Prädisposition der Kartoffel auf Sporulation von und Infektion durch Phytophthora infestans. Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz/J Plant Dis Prot. 1983; 90(1): 83–88.

Henfling JW. Late blight of potato: Phytophthora infestans. Technical Information Bulletin 4. International Potato Center, Lima, Peru, 25. 1987.

Wheeler BEJ. An introduction to plant diseases. London, New York: Wiley; 1969.

Shaner G, Finney R. Inheritance of slow mildewing resistance in wheat. Proceeding of American. Phytopathology. 1977; 28: 105–112.

Gomez KA, Gomez AA. Statistical procedures for agricultural research. John Wiley & sons; 1984.

SAS (Statically Analysis Software). SAS Institute Inc. Cary, North California. First printing, January 2004. SAS Publishing provides. 2004; 513.

Njualem DK, Demo P, Mendoza HA, Koi JT, Nana SF. Reactions of some potato genotypes to late blight in Cameroon. Afr Crop Sci J. 2001; 9(1): 209–213.

Namanda S, Adipala E, Olanya OM, Hakiza JJ, El-Bedewy R, Bhagsari AS. Integration of host resistance and minimum fungicide application for management of potato late blight in Uganda. In 5th Biennial Conference of the African Crop Science Society (Abstract). 2001 Oct; 19–26.

Simons MD. Polygenic resistance to plant disease and its use in breeding resistant cultivars. J Environ Qual. 1972; 1(3): 232–240.

Van der Plank JE. Plant disease: Epidemics and control. NY, USA: Academic Press; 1963; 349.

Nyankanga OR, Wein HC, Olanya OM, Ojiambo PS. Farmers’ cultural practices and management of potato late blight in Kenya Highlands: implications for development of integrated disease management. Int J Pest Manag. 2004; 50(2): 135–144.

Kankwatsa P, Adipala E, Hakiza JJ, Olanya M, Kidanemariam HM. Effect of integrating planting time, fungicide application and host resistance on potato late blight development in south‐western Uganda. J Phytopathol. 2002; 150(4–5): 248–257.

Singh BP, Shekhawat GS, editors. Potato late blight in India. Central Potato Research Institute; 1999.

Singh BP, Singh PH, Gupta J, Singh L. Integrated management of late blight under Shimla hills. J Indian Potato Assoc (India). 2001; 8(1): 84–85.

Islam MR, Dey TK, Rahman MM, Hossain MA, Ali MS. Efficacy of some fungicides in controlling late blight of potato. Bangladesh J Agric Res. 2002; 27(2): 257–261.

Tsakiris E, Karafyllidis DI, Mansfield J. Management of potato late blight by fungicides. In II Balkan Symposium on Vegetables and Potatoes. 2000 Oct; 579: 567–570.


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